【作者】 王燕鸿；

【导师】 王军；

【作者基本信息】 天津大学 ， 化学工程， 2005， 硕士

【摘要】 铁泥是氨基染料和中间体生产过程中产生的固体废弃物,同时又是一种含铁量较高的二次资源。但目前绝大多数回收方法都存在利用率低、有二次污染等问题,因此对铁泥开展综合治理及回收利用的研究具有现实经济和社会意义。本论文以天津染化厂铁泥为研究对象,系统研究了针对天津染化厂铁泥的干法处理工艺,其最佳工艺条件为在原料铁泥中加入50.91%的硫酸,马福炉中800℃下煅烧1h即可得到性能较好的氧化铁红产品。采用超临界氧化法资源化处理铁泥。建立了以水作为超临界介质的超临界氧化装置,该装置采用奥氏体不锈钢为釜体材料,整体锻造式设计,采用电加热-外加热方式。确定了超临界氧化资源化处理铁泥的优化工艺条件:铁泥、水进料比为20g/100g,空气压力0.25MPa,在系统压力30MPa条件下反应3h。超临界氧化处理后的样品于800℃下煅烧1h可以得到颜色鲜艳的氧化铁红颜料。采用XRD、EPMA、色差、TPR等手段对干法与超临界氧化法所得样品进行了表征。结果表明:两种处理方法均可得到晶型为α-Fe₂O₃的氧化铁红颜料;超临界氧化法可以完全去除铁泥中的有机杂质,实现了铁泥无害化处理,而干法工艺无法实现;铁红颜色的差异与晶粒大小与结构缺陷密切相关,晶粒尺寸越大,α-Fe₂O₃晶体结构越完整,所得到铁红颜色越鲜艳。更多还原

【Abstract】 Iron-mud is the solid waste which produced from amino-dye andamino-intermediate production process. It is also a kind of secondary resource withhigh amount of ferric oxide. Nowadays, most recovering methods have defects suchas low use ratio, secondary pollution and so on. So the research ofenvironment-friendly technology for iron-mud disposing and recycling has therealistic, economical and social significance.The iron-mud disposing technology through traditional dry-process to produceferric oxide red with high quality was studied. The optimum conditions are as follow:the sulfuric-acid addition concentration is 50.91%, the calcined temperature is 800℃and the last time is 1 hour.Supercritical oxidation method used water as supercritical medium wereinvestigated to dispose and recycle iron-mud environment-friendly. A supercriticaloxidation set-up, which used austenic steel as body material, integral forging andout-dot heating, were built. The optimal conditions with this set-up were: iron-mud towater ratio is 20g/100g, feeding air pressure is 0.25MPa, and reacted at 30MPa for 3hours. The samples can be changed to bright-colored red dye through firing at 800℃for 1 hour.The samples were characterized by XRD, EPMA TPR and chromatic aberrationexperiment. The results showed that both the dry process and supercritical oxidationmethod could acquire α-Fe2O3;supercritical oxidation could get rid off organicimpurity absolutely in iron-mud, while dry process couldn’t;and the color differenceof ferric oxide red are resulted from different crystal size and structure defect: thebigger crystal size and/or the less crystal defect formed, the brighter colored ferricoxide red obtained.更多还原